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ASTM Grade HK Steel vs. ASTM B631 Class A

ASTM grade HK steel belongs to the iron alloys classification, while ASTM B631 class A belongs to the otherwise unclassified metals. There are 16 material properties with values for both materials. Properties with values for just one material (17, in this case) are not shown.

For each property being compared, the top bar is ASTM grade HK steel and the bottom bar is ASTM B631 class A.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
220
Poisson's Ratio 0.27
0.3
Shear Modulus, GPa 79
85 to 86

Thermal Properties

Latent Heat of Fusion, J/g 310
160
Melting Completion (Liquidus), °C 1400
2680 to 2690
Specific Heat Capacity, J/kg-K 480
160
Thermal Conductivity, W/m-K 15
420
Thermal Expansion, µm/m-K 17
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
40 to 47
Electrical Conductivity: Equal Weight (Specific), % IACS 2.3
25 to 29

Otherwise Unclassified Properties

Density, g/cm3 7.8
15
Embodied Carbon, kg CO2/kg material 4.4
43
Embodied Energy, MJ/kg 63
670

Common Calculations

Stiffness to Weight: Axial, points 14
8.5
Stiffness to Weight: Bending, points 25
14
Thermal Diffusivity, mm2/s 3.9
180